My style of teaching is to very rarely give direct
information to a student. Instead, I'll ask a series of
impromptu questions which enables the student to
make the discovery.
This fosters a much greater depth of understanding
than if the teacher were to simply recite a fact.

I'm also less concerned about a student's making the
same chess decision that I would, than about whether
he or she has considered the relevant facts in making
that decision.

I have found that this teaching approach helps students
learn how to make reasonable decisions in unfamiliar
settings, which is of course essential to chess mastery.